openssl - OpenSSL command line tool


SYNOPSIS

       openssl command [ command_opts ] [ command_args ]

       openssl [ list-standard-commands | list-message-digest-
       commands | list-cipher-commands ]

       openssl no-XXX [ arbitrary options ]


DESCRIPTION

       OpenSSL is a cryptography toolkit implementing the Secure
       Sockets Layer (SSL v2/v3) and Transport Layer Security
       (TLS v1) network protocols and related cryptography
       standards required by them.

       The openssl program is a command line tool for using the
       various cryptography functions of OpenSSL's crypto library
       from the shell.  It can be used for

        o  Creation of RSA, DH and DSA key parameters
        o  Creation of X.509 certificates, CSRs and CRLs
        o  Calculation of Message Digests
        o  Encryption and Decryption with Ciphers
        o  SSL/TLS Client and Server Tests
        o  Handling of S/MIME signed or encrypted mail


COMMAND SUMMARY

       The openssl program provides a rich variety of commands
       (command in the SYNOPSIS above), each of which often has a
       wealth of options and arguments (command_opts and
       command_args in the SYNOPSIS).

       The pseudo-commands list-standard-commands, list-message-
       digest-commands, and list-cipher-commands output a list
       (one entry per line) of the names of all standard
       commands, message digest commands, or cipher commands,
       respectively, that are available in the present openssl
       utility.

       The pseudo-command no-XXX tests whether a command of the
       specified name is available.  If no command named XXX
       exists, it returns 0 (success) and prints no-XXX;
       otherwise it returns 1 and prints XXX.  In both cases, the
       output goes to stdout and nothing is printed to stderr.
       Additional command line arguments are always ignored.
       Since for each cipher there is a command of the same name,
       this provides an easy way for shell scripts to test for
       the availability of ciphers in the openssl program.  (no-
       XXX is not able to detect pseudo-commands such as quit,
       list-...-commands, or no-XXX itself.)


       asn1parse Parse an ASN.1 sequence.

       ca        Certificate Authority (CA) Management.

       ciphers   Cipher Suite Description Determination.

       crl       Certificate Revocation List (CRL) Management.

       crl2pkcs7 CRL to PKCS#7 Conversion.

       dgst      Message Digest Calculation.

       dh        Diffie-Hellman Parameter Management.  Obsoleted
                 by dhparam.

       dsa       DSA Data Management.

       dsaparam  DSA Parameter Generation.

       enc       Encoding with Ciphers.

       errstr    Error Number to Error String Conversion.

       dhparam   Generation and Management of Diffie-Hellman
                 Parameters.

       gendh     Generation of Diffie-Hellman Parameters.
                 Obsoleted by dhparam.

       gendsa    Generation of DSA Parameters.

       genrsa    Generation of RSA Parameters.

       passwd    Generation of hashed passwords.

       pkcs7     PKCS#7 Data Management.

       rand      Generate pseudo-random bytes.

       req       X.509 Certificate Signing Request (CSR)
                 Management.

       rsa       RSA Data Management.

       rsautl    RSA utility for signing, verification,
                 encryption, and decryption.

       s_client  This implements a generic SSL/TLS client which
                 can establish a transparent connection to a
                 remote server speaking SSL/TLS. It's intended
                 for testing purposes only and provides only

                 internally uses mostly all functionality of the
                 OpenSSL ssl library.

       s_server  This implements a generic SSL/TLS server which
                 accepts connections from remote clients speaking
                 SSL/TLS. It's intended for testing purposes only
                 and provides only rudimentary interface
                 functionality but internally uses mostly all
                 functionality of the OpenSSL ssl library.  It
                 provides both an own command line oriented
                 protocol for testing SSL functions and a simple
                 HTTP response facility to emulate an
                 SSL/TLS-aware webserver.

       s_time    SSL Connection Timer.

       sess_id   SSL Session Data Management.

       smime     S/MIME mail processing.

       speed     Algorithm Speed Measurement.

       verify    X.509 Certificate Verification.

       version   OpenSSL Version Information.

       x509      X.509 Certificate Data Management.

       MESSAGE DIGEST COMMANDS

       md2       MD2 Digest

       md5       MD5 Digest

       mdc2      MDC2 Digest

       rmd160    RMD-160 Digest

       sha       SHA Digest

       sha1      SHA-1 Digest

       ENCODING AND CIPHER COMMANDS

       base64    Base64 Encoding

       bf bf-cbc bf-cfb bf-ecb bf-ofb
                 Blowfish Cipher

       cast cast-cbc
                 CAST Cipher

                 CAST5 Cipher

       des des-cbc des-cfb des-ecb des-ede des-ede-cbc
                 des-ede-cfb des- ede-ofb des-ofb
                 DES Cipher

       des3 desx des-ede3 des-ede3-cbc des-ede3-cfb des-ede3-ofb
                 Triple-DES Cipher

       idea idea-cbc idea-cfb idea-ecb idea-ofb
                 IDEA Cipher

       rc2 rc2-cbc rc2-cfb rc2-ecb rc2-ofb
                 RC2 Cipher

       rc4       RC4 Cipher

       rc5 rc5-cbc rc5-cfb rc5-ecb rc5-ofb
                 RC5 Cipher


PASS PHRASE ARGUMENTS

       Several commands accept password arguments, typically
       using -passin and -passout for input and output passwords
       respectively. These allow the password to be obtained from
       a variety of sources. Both of these options take a single
       argument whose format is described below. If no password
       argument is given and a password is required then the user
       is prompted to enter one: this will typically be read from
       the current terminal with echoing turned off.

       pass:password
                 the actual password is password. Since the
                 password is visible to utilities (like 'ps'
                 under Unix) this form should only be used where
                 security is not important.

       env:var   obtain the password from the environment
                 variable var. Since the environment of other
                 processes is visible on certain platforms (e.g.
                 ps under certain Unix OSes) this option should
                 be used with caution.

       file:pathname
                 the first line of pathname is the password. If
                 the same pathname argument is supplied to
                 -passin and -passout arguments then the first
                 line will be used for the input password and the
                 next line for the output password. pathname need
                 not refer to a regular file: it could for
                 example refer to a device or named pipe.

       fd:number read the password from the file descriptor
                 number. This can be used to send the data via a


       stdin     read the password from standard input.


SEE ALSO

       asn1parse(1), ca(1), config(5), crl(1), crl2pkcs7(1),
       dgst(1), dhparam(1), dsa(1), dsaparam(1), enc(1),
       gendsa(1), genrsa(1), nseq(1), openssl(1), passwd(1),
       pkcs12(1), pkcs7(1), pkcs8(1), rand(1), req(1), rsa(1),
       rsautl(1), s_client(1), s_server(1), smime(1), spkac(1),
       verify(1), version(1), x509(1), crypto(3), ssl(3)


HISTORY

       The openssl(1) document appeared in OpenSSL 0.9.2.  The
       list-XXX-commands pseudo-commands were added in OpenSSL
       0.9.3; the no-XXX pseudo-commands were added in OpenSSL
       0.9.5a.  For notes on the availability of other commands,
       see their individual manual pages.



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